In Rio yesterday Bieber had a concert. Many first come first serve areas. People waited in line camping for three months. Some were selling their space for up to $300USD.
At the last minute they moved the entrance for those tickets. They all lost their space. People were not amused.
Interstate traffic was stopped and turned around, creating jams that extended 5 miles or more, not long by Atlanta standards, but many drivers were stuck in the area for hours.